package com.example.shopgateway.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Slf4j
@Component
public class GlobalGatewayLogFilter implements GlobalFilter, Ordered {
    /**
     * 开始访问时间
     */
    private static final String BEGIN_VISIT_TIME = "begin_visit_time";
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain
            chain) {
//先记录下访问接口的开始时间
        exchange.getAttributes().put(BEGIN_VISIT_TIME,
                System.currentTimeMillis());
        return chain.filter(exchange).then(Mono.fromRunnable(()->{
            Long beginVisitTime = exchange.getAttribute(BEGIN_VISIT_TIME);
            if (beginVisitTime != null){
                log.info("访问接口主机: " +
                        exchange.getRequest().getURI().getHost());
                log.info("访问接口端口: " +
                        exchange.getRequest().getURI().getPort());
                log.info("访问接口URL: " +
                        exchange.getRequest().getURI().getPath());
                log.info("访问接口URL参数: " +
                        exchange.getRequest().getURI().getRawQuery());
                log.info("访问接口时长: " + (System.currentTimeMillis() -
                        beginVisitTime) + "ms");
            }
        }));
    }
    @Override
    public int getOrder() {
        return 0;
    }
}